Investigation On The Structure And Photoca Talytic Properties Of Tin/Antimony Based Composite Materials

Photocatalytic production of H₂ or O₂,reduction of the excess CO₂,and degradation of the organic polutions,is not only a great potential to produce clean energy to replace fossil fuels to solve the energy crisis,but also the prospect of producing orga nic fuels in the production of CO₂ greenhouse gases is promising.Moreover,it has a significant effect to solve the pollution problem of organic dye water.The exploration of photocatalytic materials with well-controlled morphology and effective tuning of light absorption and bandgaps have attracted wide interest over the past decade.In this paper efforts have been taken on the design of semiconductor materials with precisely tailored bandgaps which are strongly dependent on their composition,structure,phase,size,shape and surface functionalization for better photocatalytic properties.Main results were listed as below:?1?Sb₄O₅Cl₂ hollow microspheres with self-narrowed bandgap and optimized photocatalytic performances were synthesized via a facile template-free method.It was found that the morphology of Sb₄O₅Cl₂crystallites were strongly dependent on the precursor p H value.The good photocatalytic activity of Sb₄O₅Cl₂ prepared at p H=2 may be caused by the synergistic effect of its higher light absor ption,the decreased electron-transfer resistance,the suppressed recombination of photogenerated electrons and holes,and the increased surface area.?2?The photocatalytic properties of the mixed Sb₂O₃/Sn O₂ with different weight ratios were prepared by milling method.Results show that the mixed Sb₂O₃/Sn O₂ with a weight ratio of 8:2 exhibits the best photocatalytic activity and it was caused by the excellent separation of photo-induced carriers.?3?The efficient photocatalytic hydrogen production from a n Eosin Y-sensitized Sb doped Sn O₂ system without any noble metal co-catalyst under visible light was reported here.Sb doping amount in Sn O₂ could induce bandgap narrowing,defects formation and conductivity enhancement,which played competitive roles in the photocatalytic H₂evolution.EY sensitization and Sb doping could be apllied in tstrengthening the visible-light-response of Sn O₂ photocatalysts.After Sb doping,the photocatalytic hydrogen evolution over the Sb doped Sn O₂ sample were increased by 2.02 times.After Eosin Y sensitization,the photocatalytic hydrogen production over the Eosin Y sensitized Sb doped Sn O₂ sample were increased by 59.45 times.?4?A novel g-C₃N₄ porous nanosheets/Sb doped Sn O₂nanoparticles heterojunction composite photocatalyst was designed and synthesized.This composite photocatalysts contained Sb doped Sn O₂nanoparticles and oxidized porous g-C₃N₄ nanosheets heterojunctions.Results demonstrated that t he intimate interfacial contact and heterojunction interaction between g-C₃N₄ and Sb doped Sn O₂ could significantly boost the photocatalytic activities compared with individual g-C₃N₄ and Sb doped Sn O₂ due to the effective separation of photo-induced carriers.Compared with the individual g-C₃N₄,photocatalytic CO₂ reduciton activity of this Sb doped Sn O₂@g-C₃N₄were increased by 5.45 times.